Adds usage of /usr/libexec/java_home for OS X platforms

(cherry picked from commit ff5af73)
Signed-off-by: KAWASHIMA Takahiro <[email protected]>

Author: gpichot

config/opal_setup_java.m4

@@ -95,7 +95,9 @@ AC_DEFUN([OPAL_SETUP_JAVA],[
               [ # OS X Snow Leopard and Lion (10.6 and 10.7 -- did not
                 # check prior versions)
                opal_java_found=0
-               opal_java_dir=/System/Library/Frameworks/JavaVM.framework/Versions/Current/Headers
+               AS_IF([test -x /usr/libexec/java_home],
+                    [opal_java_dir=`/usr/libexec/java_home`/include],
+                    [opal_java_dir=/System/Library/Frameworks/JavaVM.framework/Versions/Current/Headers])
                AC_MSG_CHECKING([OSX locations])
                AS_IF([test -d $opal_java_dir],
                      [AC_MSG_RESULT([found ($opal_java_dir)])